Larkspur is an annual grown for its blooms, which open from spring through fall. Notably, it shrugs off deer. Its flowers are a moderate draw for native bees, butterflies, and hummingbirds.
Zones
Data not available
pH Range
6-7.5
Sun
Full Sun
Days to Maturity
85
Score Larkspur on your exact land.
Zone averages can't see the slope, soil, frost, and sun that decide whether larkspur actually takes — and those shift from one yard to the next. Enter your address and we'll score larkspur against your land's real conditions.
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What Larkspur is
Larkspur grows as an annual and reaches around three feet at maturity. It blooms from spring through fall. It's also deer-resistant.
How to grow Larkspur
Larkspur does best in full sun — at least 6 hours of direct sun a day — and soil from pH 6 to 7.5, on well-drained ground. It needs around 500 growing degree days to mature and a growing season of at least 50 frost-free days, which is why climate matters as much as soil.
USDA Zones
Data not available
USDA PHZM 2023
Soil pH
6 - 7.5
USDA PLANTS Database
Sun
Full Sun
plant_species_v5.csv
Drainage
well (dry spells)
plant_species_v5.csv
Days to Maturity
85 days
plant_species_v5.csv
GDD Required
500+
plant_species_v5.csv
Mature Height
3 ft
plant_species_v5.csv
Frost-Free Days
50+
plant_species_v5.csv
Start the season right
Plant larkspur in full sun with at least 6 hours of direct sun, once the soil has warmed and frost risk has passed.
Match the soil
Larkspur prefers pH 6 to 7.5 (USDA PLANTS Database). A quick soil test from your local Extension lab tells you whether to add lime or sulfur to land in band.
Water steadily
Keep the root zone evenly moist through establishment. A 2–3 inch mulch layer holds moisture without waterlogging.
Harvest at its peak
Cut larkspur blooms in the cool of the morning, just as they open, for the longest display.
Good to know
One caution for pet owners — larkspur is toxic to dogs and cats and horses (severe severity). Keep it out of reach, and call ASPCA Animal Poison Control at (888) 426-4435 in an emergency. (Source: ASPCA.)
Larkspur offers moderate value to bees and other pollinators. (Source: Xerces Society, Pollinator Partnership.)
Where Larkspur thrives
Whether larkspur thrives on a given site comes down to its soil pH, drainage, sun, and frost dates — the conditions that vary parcel to parcel.
See if Larkspur will thrive on your land
Zone averages are a start. Your exact soil pH, drainage, sun exposure, and frost dates shape whether larkspur actually takes — we score it against the real conditions at your address.
Three things about your exact spot that zone averages miss:
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
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Frequently Asked Questions
Can I grow Larkspur in my zone?
Zone data for larkspur is being finalized. A Growable Ground report checks your parcel's full suitability against federal soil, climate, and zone data.
When should you plant Larkspur?
Most growers plant larkspur after the last spring frost, once the soil has warmed, leaving enough of the season for its 50-day frost-free need. Your local frost dates set the exact window — a Growable Ground report reads them for your address.
How much sun does Larkspur need?
Larkspur needs full sun — a spot that catches at least 6 hours of direct summer sun a day. In more shade it still grows, but usually gives a smaller, later crop. The catch is that a yard rarely gets even light everywhere — a fence, the house, or one tall tree can quietly take those hours. A Growable Ground report reads the real sun-hours across your land, canopy and buildings included, so you can pick the brightest bed before you plant.
What soil does Larkspur need?
Larkspur prefers soil pH 6 to 7.5, on well-drained ground (USDA PLANTS Database). Your report scores your parcel's actual soil against that using USDA SSURGO data.
Does Larkspur attract pollinators?
Yes — larkspur's flowers are a solid nectar source for native bees, butterflies, and hummingbirds (Xerces Society, Pollinator Partnership).
Is Larkspur safe for pets?
Larkspur is toxic to pets (dogs,cats,horses) with severe severity. Keep it out of reach, and call ASPCA Animal Poison Control at (888) 426-4435 in an emergency.